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Texas Instruments BQ2002SNTRG4
- Part No.:
- BQ2002SNTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2002SNTRG4.pdf
- Description:
- IC BATT CONTRL MULTI-CHEM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
BQ2002SNTRG4 from Texas Instruments is an NiCd/NiMH fast-charge management IC in 8-pin narrow SOIC (D) package, providing -∆V and peak voltage (PVD) termination, maximum voltage (2 V ±5%), temperature cutoff (0.5 × VCC ±5%), and time-limited fast charge (40–160 min). It delivers open-drain CC output for external MOSFET control and LED status indication, used in portable medical devices, cordless telephones, and rechargeable power tools.
For engineers reviewing the BQ2002SNTRG4 datasheet, BQ2002SNTRG4 pinout, BQ2002SNTRG4 application, or BQ2002SNTRG4 equivalent, key selection criteria include verified -∆V detection (−12 mV ±3 mV), TM-pin-selectable top-off rate (C/16 or C/32), pulse-trickle capability (C/32 or C/64), low-power mode (<1 µA), and compatibility with 5.0 V ±20% supply.
Technical Context
The BQ2002SNTRG4 implements a state-machine-based charge controller with five independent termination conditions: −∆V, PVD, maximum cell voltage (2 V), maximum temperature (via TS pin at VTCO = 0.5 × VCC), and programmable safety timer. Voltage sampling occurs every 17 s using 16 (−∆V) or 32 (PVD) measurements averaged over 570 µs intervals to reject 50/60 Hz ripple.
Its TM pin selects three-level configurations for fast-charge duration, top-off enablement, trickle rate, and hold-off timing; INH pin suspends fast charge and top-off while preserving pulse-trickle; and CC output modulates during top-off (286 µs active / 4290 µs inactive) to deliver 1/16th fast-charge current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.0–6.0 V - supports standard 5 V rail with ±20% tolerance; enables operation across wide input variance without LDO. |
| Fast-charge termination | −∆V (−12 mV ±3 mV) or PVD (−2.5 mV ±2.5 mV) - dual-mode detection prevents false termination on aging batteries. |
| Max cell voltage limit | 2.0 V ±5% - ensures safe charging of single NiCd/NiMH cells; requires resistor divider on BAT pin for multi-cell packs. |
| Temperature cutoff | VTS < 0.5 × VCC ±5% - uses external NTC thermistor network between VCC and VSS for low-cost thermal monitoring. |
| Standby current | <1 µA - achieved when VBAT ≥ VCC − 1.5 V; reduces system power draw during battery removal or storage. |
| CC output drive | Open-drain, 10 mA sink - directly drives gate of external N-channel MOSFET for current control without level-shifting. |
| LED output | Open-drain, active-low during fast charge - provides unambiguous visual status without external pull-up dependency. |
Pinout & Package
Package: 8-pin narrow SOIC (D), 3.91 mm × 4.90 mm × 1.75 mm height, RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TM) | Timer mode select input | Three-level analog input (low/mid/high) configuring fast-charge time, top-off enable, PVD/−∆V mode, and trickle rate. |
| 2 (LED) | Charge status output | Open-drain indicator: low = fast charge active; high-Z = all other states (top-off, trickle, idle, inhibit). |
| 3 (BAT) | Battery voltage sense | High-impedance (≥50 MΩ) input for resistor-divider-scaled battery voltage; must be ≤2 V for single-cell validation. |
| 4 (VSS) | System ground | Reference node for all analog measurements and digital logic; requires low-impedance PCB connection. |
| 5 (TS) | Temperature sense input | Accepts voltage from NTC thermistor divider; triggers termination if VTS falls below 0.5 × VCC ±5%. |
| 6 (VCC) | Supply voltage input | 5.0 V ±20% power rail; powers internal bandgap reference, comparators, and state machine. |
| 7 (INH) | Charge inhibit input | Active-high logic input freezing fast charge and top-off timers; resumes from suspension point when deasserted. |
| 8 (CC) | Charge control output | Open-drain output modulating external MOSFET: high-Z = charge enabled; low = charge inhibited. |
Key Features
| Feature | Design Value |
|---|---|
| −∆V and PVD dual-mode termination | Prevents premature cutoff on aged NiMH cells by selecting optimal detection method via TM pin configuration. |
| Programmable top-off phase | Extends charge post-fast-termination at C/16 rate (for C/2 or 1C fast rates) to recover up to 5% additional capacity. |
| Pulse-trickle maintenance | Delivers C/32 or C/64 average current using 286 µs pulses to offset self-discharge without overcharging. |
| Low-power shutdown | Reduces ICC to <1 µA when VBAT ≥ VCC − 1.5 V, enabling battery-presence detection without continuous drain. |
| Integrated bandgap reference | Stabilizes all voltage thresholds (VMCV, VTCO, PVD, −∆V) against supply and temperature drift for consistent termination. |
Applications
| Portable Medical Devices | Cordless Telephones |
|---|---|
|
Use Scenario: Rechargeable NiMH battery pack in handheld blood glucose meters requiring reliable full-charge detection and thermal safety. IC Role / Device Role / Timing Role: Primary charge controller managing fast charge, top-off, and temperature-monitored termination per IEC 62368-1. Use Value: Prevents overvoltage (2 V limit) and overheating (0.5 × VCC cutoff) while delivering repeatable −12 mV −∆V detection for accurate end-of-charge signaling. |
Use Scenario: Base station battery charger for DECT cordless handsets operating in variable ambient temperatures. IC Role / Device Role / Timing Role: Standalone NiCd charge manager with LED status feedback and INH-controlled charge scheduling. Use Value: Enables automatic restart after power interruption and maintains trickle top-up (C/64) during standby-extending shelf life without user intervention. |
| Rechargeable Power Tools | Emergency Lighting Systems |
|
Use Scenario: 3-cell NiCd pack in compact drill chargers needing robust termination under high-current (2C) fast-charge conditions. IC Role / Device Role / Timing Role: Fast-charge safety supervisor using TM = high for 40-min max timer and −∆V termination. Use Value: Guarantees charge completion within fixed window while rejecting line-frequency noise via 17-s sampling interval and 16-point averaging. |
Use Scenario: Backup lighting with sealed NiMH battery, requiring maintenance charging during AC mains availability. IC Role / Device Role / Timing Role: Maintenance charger implementing pulse-trickle (C/32) and periodic top-off cycles. Use Value: Eliminates need for manual battery replacement by sustaining >95% capacity over 2+ years via regulated trickle and optional top-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NiCd/NiMH fast-charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX713 | Uses fixed 1.25 V reference; no TM pin; only −∆V termination; requires external op-amp for voltage scaling. | Lacks PVD mode and programmable top-off; limited to single-rate fast charge (C/3 or C/2). | Select MAX713 only when design requires minimal external components and accepts reduced termination flexibility. |
| BQ2004 | Includes integrated MOSFET driver; adds SMBus interface; supports dual-cell voltage sensing; higher quiescent current (300 µA). | Enables system-level charge control and telemetry but increases BOM cost and layout complexity. | Choose BQ2004 when host microcontroller integration, real-time status reporting, or dual-cell support is required. |
Compared with MAX713 and BQ2004, the BQ2002SNTRG4 offers the broadest combination of analog configurability (TM pin), lowest standby power (<1 µA), and dual-termination mode selection-making it optimal for cost-sensitive, self-contained NiCd/NiMH chargers where firmware-free operation is critical.
Availability
BQ2002SNTRG4 is available at Aetrix Electronics and suitable for portable medical devices, cordless telephones, rechargeable power tools, and emergency lighting systems requiring stable component supply and long-term lifecycle support.
Supply support for BQ2002SNTRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery management ICs.
The BQ2002SNTRG4 belongs to TI's bq200x family of standalone NiCd/NiMH charge controllers, designed specifically for cost-effective, high-reliability charging in consumer and industrial portable equipment without microcontroller dependency.
FAQ
What battery chemistries does the BQ2002SNTRG4 support?
The BQ2002SNTRG4 supports nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries exclusively. It is not rated for lithium-ion, lithium-polymer, or lead-acid chemistries. Its termination algorithms-including −∆V detection, peak voltage (PVD), and 2 V maximum cell voltage-are calibrated specifically for the voltage profiles and thermal behavior of NiCd/NiMH cells. Using BQ2002SNTRG4 with other chemistries risks unsafe charging conditions and invalidates all safety guarantees in the datasheet.
How does the TM pin configure fast-charge timing and termination modes?
The TM pin on the BQ2002SNTRG4 is a three-level analog input that sets fast-charge duration (40/80/160 min), top-off enablement, PVD vs. −∆V termination selection, and pulse-trickle rate. A mid-level voltage (VCC/2 ±0.5 V) configures PVD mode with 160-min timer and C/32 trickle; high-level enables −∆V mode with 40-min timer and C/32 trickle; low-level selects PVD with 80-min timer and C/16 top-off. This eliminates external resistors or jumpers for variant configuration.
Can the BQ2002SNTRG4 manage multi-cell NiMH battery packs?
Yes, the BQ2002SNTRG4 can manage multi-cell NiMH packs when used with an external resistor divider on the BAT pin. The divider must scale total pack voltage so the BAT input remains ≤2.0 V (e.g., for a 3-cell pack: RB1/RB2 = 2, yielding 2 V at BAT when pack = 6 V). Input impedance must be 200 kΩ–1 MΩ. Temperature sensing remains per-pack via single TS input. No internal cell balancing or individual cell monitoring is provided.
What is the function of the INH pin on the BQ2002SNTRG4?
The INH pin on the BQ2002SNTRG4 is an active-high charge inhibit input that suspends fast charge and top-off activity while preserving pulse-trickle operation and temperature monitoring. When INH goes high, the internal timer freezes, LED remains in its current state, and CC output disables charging current. Upon returning low, BQ2002SNTRG4 resumes exactly where it left off-enabling precise charge scheduling without cycle restart or capacity loss.
Does the BQ2002SNTRG4 require external components for basic operation?
Yes-the BQ2002SNTRG4 requires at minimum: (1) a resistor divider on BAT for multi-cell voltage scaling, (2) an NTC thermistor network on TS for temperature sensing, (3) pull-up resistors on LED and CC outputs (if driving LEDs or MOSFET gates), and (4) decoupling capacitor on VCC. No external clock or precision references are needed-the BQ2002SNTRG4 integrates a bandgap reference and internal oscillator. All timing and thresholds derive from this internal circuitry.
BQ2002SNTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- Voltage
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 2V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
BQ2002SNTRG4 FAQ
1.How can I place an order for BQ2002SNTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2002SNTRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ2002SNTRG4 reliable?
The price and inventory of BQ2002SNTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2002SNTRG4 is usually 5 days.
3.What payment methods are accepted for BQ2002SNTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2002SNTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2002SNTRG4?
BQ2002SNTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2002SNTRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ2002SNTRG4?
For technical support, including BQ2002SNTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2002SNTRG4 requirements.
6.How does Aetrix verify that BQ2002SNTRG4 is sourced from the original manufacturer or authorized distributors?
All BQ2002SNTRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ2002SNTRG4 meets industry standards.
7.What is the process for return or replacement of BQ2002SNTRG4?
All BQ2002SNTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2002SNTRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ2002SNTRG4 part is unused and in its original packaging.
Return procedure for BQ2002SNTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2002SNTRG4 Tags
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BQ21040DBVR
Texas Instruments
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